Acetylene-burner.



J. B. CARROLL.

AGETYLBNE BURNER.

APPLIGATION FILED DEG. 21. 1911..

Patented .13.11.14, 1,913.

MMM-..

ITED STATES PATENT ICE.

JOI-IN B. CARROLL, OF CHICAGO, ILLINOIS.

ACETYLE-NE-BURNER.

noaoas.

To all whom t may concern:

Be it known that I, JOHN B. CARROLL, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Acetylene-Burners, of which the following is a specification.

In U. S. Letters Patent No. 817,750, granted to me April 17, 1906, I have shown an acetylene burner having opposed cylindrical flame-chambers of considerable width, in which the gas is burned as a central jet of flame at some distance from the surrounding imperforate wall, the air required to effect the combustion moving inward toward the gas-orifice, between the llame and the heated wall. lVhen a burner of this type and of the proportions shown and described is supplied with gas under the normal pressure, a temperature is maintained at the orifice above that which permits the accumulation of carbon or solid hydrocarbons. When the supply of gas to such a burner is restricted to give a low flame, however, carbon accumulates at the orifice and the burner soon chokes.

The present invention is a burner fundamentally of the type shown in my specified patent, but having an improved construction which permits it to be operated not only with the normal gas-pressure and full ame, but with a pressure and flame which may be decreased to any desired extent, that is a turn-down burner.

'Ihe preferred construction is illustrated in the accompanying drawing, in which- Figure 1 is a side elevation of the complete burner; Fig. 2 is a vertical section in a plane passing through the axes of the flame-chambers; and Fig. 3 is a transverse section of one of the branches, on the line III-III of Fig. 2.

The burner illustrated is one of the duplex type, having two branches 1, 1, leading from a trunlr 2, which is supported in the upper end of a metal tube 3. The branches and trunk preferably consist of a single piece of lava, steatite, or other heat-insulating material, although the branches may consist of separate pieces. In the inner face of each branch is a recessed iamerhamber 4c, which is preferably cylindrical and has a flat bottom 5. Within each branch is a gas-supply conduit 6, leading from a central passage 7. A minute cylindrical duct 8 extends from the conduit to the Same-chamber,

Speccaton of Letters Patent.

Application led December 21, 1911.

Patented Jan. 141, 1913.

serial No. 667,138.

the duct and chamber being in axial alinement.

In the burner of my previous patent, the cylindrical recess constituting the flamechamber has a normal width, in fractions of an inch, of 0.18,' and a depth of 0.12, the walls being imperforate. In the present burner, this cylindrical recess 4 still has a preferred width of 0.18, but the depth is greatly increased, preferably to about 0.23. The walls of this recess are also provided with a. number of radially-extending circular holes, here shown as four in number, spaced at an angular distance of 90. In the present burner these holes are 0.10 in diameter and the base of the flame chamber is 0.10 below these holes, giving a flamechamber having an imperforate wall of a net depth of 0.10, or nearly the same as that of my previous patent.

When acetylene is supplied to this burnerat the normal pressure of about two and one-half inches of water, the gas escaping from the duct 8 burns as a small central jet in each flame-chamber, and the flames from the two branches impinge at right angles and spread out into a broad thin flat flame. A stream of air continuously passes inward between the imperforate heated sides of each chamber and the central jet of llame, being thereby raised to a highertemperature before it reaches the central duct. The gas escaping from the duct meets the hot air and springs into iiame, the base of the flame being at or in such proximity to the orifice that its walls are maintained at a temperature above that which will permit the deposit of carbon, or will cause it to be at once oxidized by the heated air if deposited. Thus the normal operation of this burner is identical with that of the burner of my previous patent, except that air flowing rearwardly around the central flame-jets enters through the lateral holes 9, instead of being supplied entirely through the open end of the flame-recess. lWhen the supply of gas is largely cut off, the llame entirely loses its normal characteristics, and no longer springs in the form of narrow luminous central jets from the orices 8. Two short flames, having substantially the width of the flame-chambers 4, then rise from the outer ends 10 of the branches, the bases of these flames practically seating on these ends. The ends of the flame-chamber walls are thereby maintained at Such temperature that no carbon deposits upon them, and the flames may be turned as lon' as desired, even to a point vwhere they become non-luminous and almost invisible7 without causing any deposit,

in my previous patent, I have stated, referring to the burner shown therein7 that t it the surrounding Wall of the recess is removed or pierced With holes Which Will permit an inrush of cold air, thc flame remains unchanged in shape and appearance, but the critico soon cholres. This statement is equally true oit the present burner7 referring to that portion ot the wall, beneath the openings 9, which incloses the normal flamechamber. rlhis imperl'orate Wall is necessary to retain the heat and thereby heat the air.I moving inward between its hot surface and the central jet of tiame, to a temperature which will prevent the deposit-ion ot' carbon at the orifice; it also shields the 'llame and protects it from drafts. The width and depth of this Vtiamechamber, proper, should, as heretofore, bear a certain relation to each other and to the normal gas jnessure. The position ot' the air-inlet holes is also important, holesI which are too tar trom the base of the flan'ie-chamber adm/itting insuliicient air to the base of the flame, and holes which are too near the base oit the flameschamber admitting;` too much cold air.

lillhile the commercial burner usuaily comprises tivo branches With opposed fiame chambers, it Will be understood that a burner having a single gasoutlet and flamechamben giving a candlelike flame, may be employed.

l claim:

l. An acetylene burner, having,` a supplyconduih a recessed flame-chamber of suili cient Width to admit air to the base of the flame, and a duct extending from said conduit to said chamber, the Walls of said chamber having an air-inlet or inlets at such distance -from the base of said chamber that sutiicient preheated air is supplied to the normal flame to maintain at the burner-orilice a temperature above that Which permits the accumulation of carbon or solid hydrocarbons.

Q. An acetylene burner9 having a supplyconduit, a cylindrical flame-chamber of suii- :nueces-se cient Width to admit air lo the base olA the flame, and a short central duct extending from said conduit to said chamber, the Walls of said chamber having an air-inlet or inlets at such distance trom the base of said chamber that sufficient. preheated air is supplied to the normal flame to maintain at the burnerorifice a temperature above that which permits the accumulation oit carbon or solid hydrocarbons.

An acetylene burner, having tivo supply-conduits, two opposed recessed flamechambers ot sutlicient Width to admit air to the base ot' the ame, and ducts extendingfrom said conduits to said chambers7 the Walls of each chamber having an air-inlet or inlets at such distance from the base of said chamber that sullicient preheated air is supplied to the normal flame to maintain at the burner-orilice a temperature above that which permits the accumulation oli carbon or solid hydrocarbons.

4t. An acetylene burner, having tivo supply-conduits, tivo opposed cylindrical flamechambers of sutlicient Width to admit air to the base of the flame, and short central ducts extendingfrom said conduits to said chambers, the Walls of each chamber having1 an air-inlet or inlets at such distance trom the base of said chamber that sufficient pre heated air is supplied to the normal flame to maintain at the burner-orifice a temperature above that which permits the accumulation of carbon or solid hydrocarbons.

5. An acetylene burner, having t-Wo supply-conduits, two opposed cylindrical fiamechambers of sufiicient Width to admit air to the base ot' the fla-me, and short central chiots extending from said conduits to said chambers, the Walls of each chamber having a series of radial airsinlets at such distance from the base of said chamber that suflicicnt preheated air is supplied to the normal flame to maintain at the burner-critice a temperature aboveV that which permits the accumulation of carbon or solid hydrocarbons.

In testimony whereof l aliix my signature in presence of tivo Witnesses.

JOHN B. CARROLL.

Witnesses CHAS. F. CROSBY, C. W. CRnIoi-rroN.

@denies ont this patent may be obtained for five cents each, by addressing the Commissioner of I-atents7 Washington, Ill. 

